Catocala benjamini, or Benjamin's underwing, is a moth of the family Erebidae. The species was first described by Auburn Edmund Brower in 1937. It is found in the US states of Arizona, Nevada, southern California and southern Utah.

Catocala benjamini was formerly considered to be a subspecies of Catocala andromache.

Adults are on wing in June. There is probably one generation per year.

The larvae feed on Quercus gambelii (Gambel oak).

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